body, html {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    background-image: linear-gradient(to right, #4cb8d4, #1a7a8c);
}

header {
    background-image: linear-gradient(to right, #6dd5ed, #2193b0);
    color: white; 
    text-shadow: 1px 1px 2px rgba(0,0,0,0.2); 
    padding: 20px;
    text-align: center;
}

#bookTitle {
    margin-bottom: 10px;
}

#bookIntroduction {
    margin-bottom: 20px;
}

.chapters-container {
    display: flex;
    flex-direction: column;
    max-height: 600px;
    overflow-y: auto;
    padding: 10px;
}

.chapter-item {
    padding: 10px;
    margin-bottom: 5px;
    cursor: pointer;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1); 
    border-radius: 8px; 
    border: 1px solid #ddd;
    transition: background-color 0.3s;
}

.chapter-item:hover {
    background-color: #f0f0f0;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

.chapter-item:before {
    font-family: 'Font Awesome';
    content: '★';
    margin-right: 10px;
    color: #ff6347; 
}
@media (max-width: 768px) {
    .chapters-container {
        padding: 20px;
    }
    .chapter-item {
        padding: 15px;
    }
}
